Spraying machine



Dec. 11, 1928. 1,694,806

F. H. YALE SPRAYING MACHINE- Filed June 14, 1926 W INVENTOR.

A TTORNEY.

Patented Dec. 11, 1928.

STATES PATENT @Fll'itiifl.

FRANK H. YALE, 01* ALAMEDA, CALIFORNIA, ASSTGNOR OF ONE-HALF TO CONRAD B. SOVIG, OF SAN FRANCISCO, CALIFORNIA.

SPBAYING MACHINE.

Application filed June 14,

This invention relates to improvements in spraying machines and more particularly to machines for spraying hot asphalt, tar and the like. Broadly stated the invention con- 5 sists of the novel combination and arrange ment of the parts of the machine.

The principal object of the invention is to provide a simple, efficient,portable machine for reducing asphalt to the liquid state by heat and pumping the same through flexible conduits or tubes and manually spraying it directly against the surface to be covered. Another object'is to provide proper pressure regulation on the liquid, to maintain a uni;

form flow. A further object is to agitate and maintain a constant uniform temperature and fluidity throughout. Another important object to provide means for reversing the flow of liquid so that the conduits can be emptied. and washed clean before shutting down the machine. Other objects and advantages will appear as this description progresses.

In this specification and the annexed drawings the invention is illustrated in the form considered the best, but I do not wish to be understood as confining it to this form, because it may be embodied in other forms and it is also to be understood that in and by the claims following the description it is desired to cover the invention in whatsoever form it may be embodied.

In the accompanylng one sheet of drawings, Figure 1 is a side view, showing the vat in vertical section, of a machine constructed in 5 accordance with this invention. Figure 2 is an end view of the same in vertical section on the line IITI.

In detail the construction illustrated in the drawings comprises a portable truck, having the platform 1, mounted at the rear on two wheels 2 on an axle fixed to the platform. The front wheels 3, supporting the front of the platform are mounted upon an axle swinging on a king pin l, so that the front wheels can out under the platform to facilitate maneuvering the truck in a limited space, bymeans of the draft handle 5 pivoted to the front axle thill 6.

The heating tank for containing the liquid asphalt comprises the vat 7, preferably with a rounded bottom as shown in Figure 2, to concentrate the flow of liquid toward the 1926. Serial No. 115,857.

pump inlet. The vertical side walls of the vat are bent and extend laterally at 88 and rest upon the enclosing side walls 9, to which they are fixed, leaving the heating spaces 10-1O on both sides of the vat. These spaces are vented at the top by the holes 1111 in the extensions 88. The opposite ends of the vat are closed by being riveted'to the end walls 1212, that are joined at the corners with the side walls 99, to form a complete enclosure for the vat, except at the top. This supporting enclosure for the vat is lagged at 18, with cork tile, or other heat insulating material, covered with sheet metal over its entire exposed outer surface to retain the heat to which the vat is exposed.

One of the end walls 12 is provided with the opening 1 1, having the transverse bar 15, supporting the end of the gas or oil burner 16, extending beneath the vat and having its opposite end supported in the other wall 12. This burner may be of any desired type, many ofwhich are available on the market, consisting of the self generating type, making its own gas from hydrocarbons as illustrated or of the open burner or blast type or an open fire using wood or other hard fuel may be used. The burner 16 is supplied wth oil fuel through the tube 17, leading to the reservoir 18, located at'any point safety remote from the fire box. The fuel is controlled at the burner by the valve 19, and at the reservoir by the shut off cock'20. The top of the platform beneath the vat, forming the fire box floor should be covered with fire brick, sand or other fire resisting material, as at 21.

There are many types of pump available but the preferred form is the double gear pump shown, in which two gears fixed upon the shafts 2223 are revolved within the enclosing casing-24l. This casing has the lower inlet 25, and the top outlet 26. The pump is conveniently mounted upon the plate 27, bolted to the end 12 of the vat.

The pump is driven by the shaft 23, extending through the packing gland 28. The

i drive shaft 23 extends through suitable journal hearings in the gear casing 29, containing a worm gearing, the worm of which is fixed on the end of the shaft 80 of the motor 81, whereby the speed of the motor shaft is re duced to the proper ratio to drive the pump at about 300 R. P. M. The worm gear is desirable for the present use, because it is self contained and well protected. There are other types of gearing such as sprocket and chain, gears and pinions and the like, that are less expensive, but have certain disadvantages in dangerto operatives, exposure to interference and difliculties in lubrication. An electric motor is ideal where such power is avail able, but it is obvious that internal combustion motors, steam and other forms of prime movers are equally applicable for the purpose. V

'Sincehot tar, asphalt and other heaVy liquids are sluggish in flow and may varyin specific gravity within its own mass it is desirable to provide some means for circulating it constantly within the vat, to prevent stratificationand lumping. This is accomplished by means ofthe propeller 32 fixedupon the shaft 23, adjacent to the pump for agitation and circulation of the asphalt.

The motor 3lis'wired through a reversing sWitch'33, so arranged that the motor can be caused torun in either direction, selected by the hand lever 34 adapted to reverse the contacts accordingly. l Vhere other forms of prime mover are used a reverse gearing must be substituted for the'reversing switch 33.

The liquid discharged from the pump through the outlet 26, is forced through the outlet pipe 35 that is carried out over the top of the vat and connected with the flexible metallic conduit or tubing 36. The outer end of'this tubing terminates in the spray'tip'37, provided with astop valve controlled by the handle 38, for regulating and stopping the flow. To protect the operatorfrom'tne heat of the tube it is covered with a section of cotton hose or other insulatingsheath 39.

To protect the machine from the elements, the vat is covered by the hinged doors,4445, hinged to the beam 46, extending across and supported by the end lagging 18-13, and resting upon the extensions 47 fixed to the side lagging 13-13. The motive gearing and connectionsare protectedby a proper housing 48'built therearound and provided with a hinged door (not shown), to permit easy access when desired.

When-theyalve at 38 is closed the back pressure created in the tube 36,-acts on the conventional spring actuated pressure regulater 40, which opens and-permits the liquid from the pump to flow back into the vat at 41. This pressure may be regulated by'the handle 42 so that obstructions or pressure variations in pump output will-not seriously vary the spray discharge at the nozzle 87. To further aid inmaintaining a uniformpressure discharge the air chamber 43 is interpose'din the discharge line between the pump, the pressure regulator and the spray tip to act as a compressible air cushion compensating for pressure variations, too sensitive to be handled by the pressure regulator.

This invention operates substantially as follows: Thematerial most in demand for weather proofing, in this class isgrade E asphalt which must be reduced from a solid to a liquid by heat. This may be done within the vat 7, but where. large areas are to be covered asin cement docks, Walls of buildings, bridges and the like, it is preferable to melt the asphalt at a central station and deliver by m'otori tanlrtrueks to the job and keep the vat filled by transferring it there as required; in this-mannereconomy in operation=is accon'iplished and the sprayin machine is more portable with a smaller load of material. The tap 49, on the pump inlet may be used to pump liquid from the supply tank into the vat.

i/Vhen the vat is firstfilled the burner16 is lighted and the mass-of material therein is maintained at the properfiowing temperature about 140 Fahrenheit, then the switch handle 34 isthrowuinto-the position shown in Figure 1,'for pumping out of-"the vat, through the various mechanisms previously described. The liquid asphalt issuing from the tip 37, inthe form eta spray, is directed against the surface to*be coated,'into which it is driven by the pressure, insuringthe maximum penetration and adherence for such a materiahwhich may be evenly and economically distributed according to the skill of the operator. When the operator closes the handle 38,-the liquidflows from the pump back into'the vat at 41, until the handle38 is-again thrown to the open position. By this invention the-asphalt can *be'direeted against ceilings and overhead surfaces without the materialdripping and covering=the operator and the floor or surface I beneath, which is not true where such attempts are made by hand 'brushing, thus greatly increasing the scope ofsurface applicationfor asphaltin'g.

lVhen the job is finished and it is desired to put themachine out of commission, the remaining asphaltin the-vat 7 isdrained out through-the 'tap 50;-the switch lever'34 is thrown to the reverse position which reverses themotor and causes the pump toreverse and suck back through the tip '37, whiclris immersed ina bucket ofkerosene, distillate or the like, which cutsall the asphalt out of the tube 36, the intervening mechanisms and the pump, leaving every .passage clear for the next operation of spraying.

So far as I am aware there isno spraying machine existing that will handle liquids of the consistency of hot asphalt, but it is obvious that cold solutions of tar, paint-and the like of similar consistency may be handled according to my invention whether hot or cold, or howsoever reduced; to the liquid state.

Having thus described this invention what IOU I claim and desire to secure by Letters Patent is:

A spraying machine comprising a vat having surrounding heating spaces; a burner beneath said vat and heating spaces; a pump submerged in said vat and having a shaft protrading within and without the walls of said vat; an agitator mounted upon said pump shaft within the vat; a motor connected with said ump shaft without said vat; a pressure 10 fixed my signature.

FRANK H. YALE. 

